Do I need to keep IOS and cIOS wads on SD after hacking Wii 4.3e?

Hello All

Successfully followed the hacking guide and installed the cIOS's and IOS's.

Do I need to keep these wads on the SD card as I'd like to save a bit of space if I could?

Oh, I also backed up my NAND and keys before modding. But then misplaced them. After installing IOS 202, I made another backup of the NAND and keys. I have priiloader installed. Have I screwed things up in the event that I brick my Wii?